Juan Sánchez-Monreal

• PhD in Fluid Mechanics
• Researcher at German Aerospace Center (DLR)

The dynamic response of structural elements subjected to blast loading is a problem of growing interest in the field of defense and security. In this work, a novel computational tool for the rapid evaluation of the effects of explosions, hereafter referred to as SimEx, is presented and discussed. The classical correlations for the reference chemica...

The dynamic response of structural elements subjected to blast loading is a problem of growing interest in the field of defense and security. In this work, a novel computational tool for the rapid evaluation of the effects of explosions, hereafter referred as SimEx, is presented and discussed. The classical correlations for the reference chemical (...

INN-BALANCE in a nutshell Fuel cells are a mature technology ready for scale-up in the automotive market. It is now about advancing manufacturing through reducing costs of production, while increasing the overall efficiency and reliability of fuel cell systems in cars. These are the goals of INNBALANCE. The EU funded research and innovation project...

PEMFC can be used in combination with different energy storage system (ESS) such as batteries of capacitors. This combination could reduce the performances demand to the PEMFC. The resulting hybrid system uses the PEMFC as primary power source while the ESS is used to compensate the PEMFC slow dynamic. An adequate ESS is able to provide a faster re...

A key requirement for PEM fuel cells for transport applications is longevity with a targeted lifetime of 5,000-6,000 h for light duty electric vehicles (LDV) and 25,000-30,000 h for heavy duty vehicles (HDV) [1]. In parallel, other KPIs such as high power density at certain voltage level (2024 target: 1.8 A cm ⁻² at 660 mV for LDV) and low Pt-loadi...

A key requirement for PEM fuel cells for transport applications is longevity with a targeted lifetime of 5,000-6,000 h for light duty electric vehicles (LDV) and 25,000-30,000 h for heavy duty vehicles (HDV). In parallel, other KPIs such as high power density at certain voltage level (2024 target: 1.8 A cm-2 at 660 mV for LDV) and low Pt-loading (2...

Starvation, flooding, and dry‐out phenomena occur in polymer electrolyte membrane fuel cells (PEMFCs), due to heterogeneous local conditions, material inhomogeneity, and uneven flow distribution across the single cell active area and in between the individual cells. The impact of the load level and air feed conditions on the performance was identif...

This paper presents an isothermal, single-phase model for direct ethanol fuel cells. The ethanol electro-oxidation reaction is described using a detailed kinetic model that is able to predict anode polarization and product selectivity data. The anode kinetic model is coupled to a one-dimensional (1D) description for mass and charge transport across...

http://www.tecnologiaeinnovacion.defensa.gob.es/Lists/Publicaciones/Attachments/220/Boletin%20de%20Observaci%C3%B3n%20Tecnol%C3%B3gica%20n%C2%BA%2055_vf.pdf

Invited talk at the INTA’s 75th aniversary security conference on protection of buildings against explosions.

A 1D+1D model for liquid-feed direct ethanol fuel cells with detailed ethanol electro-oxidation kinetics is presented. One-dimensional convective transport along the flow channels is coupled to a one-dimensional description for species transport across the MEA accounting for the effect of the electrochemical reactions and the mixed potential due to...

Ethanol electro-oxidation is known to proceed through a series of elementary reactions that involve free and adsorbed species, like acetyl, hydroxyl, and carbon monoxide, and lead to a mixture of oxidation products such as acetaldehyde, acetic acid, carbon dioxide and methane. The major electro-oxidation products of ethanol on Pt electrodes are ace...

A one-dimensional model is proposed for the anode of a liquid-feed direct ethanol fuel cell. The complex kinetics of the ethanol electro-oxidation reaction is described using a multi-step reaction mechanism that considers free and adsorbed intermediate species on Pt-based binary catalysts. The adsorbed species are modeled using coverage factors to...

SimEx es una aplicación informática basada en Matlab y desarrollada en el contexto del Grado en Ingeniería de la Seguridad de la Universidad Carlos III de Madrid, impartido en el Centro Universitario de la Guardia Civil (CUGC) de Aranjuez. El propósito inicial de SimEx era evaluar el efecto de explosiones sobre elementos estructurales sencillos, co...

A 1D across-the-channel model is proposed for the anode of a Direct Ethanol Fuel Cell. The complex kinetics of the multi-step ethanol oxidation reaction is described using the reaction mechanism proposed by Meyer et al. [Electrochim. Acta, 56, 4299 (2011)], which considers free and adsorbed intermediate species on a Pt-based binary catalyst. The ad...

Direct Ethanol Fuel Cells (DEFCs) offer a clear alternative to hydrogen and/or methanol fuel cells due to the high energy density of ethanol, a renewable fuel that can be readily produced by the fermentation of biomass and which is much less toxic than methanol. Nevertheless, due to the complex kinetics of the ethanol oxidation reaction (EOR), comp...

Adequate water management represents one of the main challenges in the design and operation of polymer electrolyte membrane fuel cells. In this work, the influence of inlet gas humidification on cell performance is investigated by in-situ current density measurements obtained using the segmented cell approach. Particular attention is paid to the co...

La respuesta dinámica de una estructura sometida a cargas explosivas es un problema de gran interés en eí ambito de la Defensa y Seguridad. En este trabajo se presenta una plataforma computacional para el estudio de los efectos de una onda expansiva sobre elementos estructurales simples. Para ello se utilizan correlaciones semiempíricas para las ex...

Water management represents one of the main challenges for the design and operation of polymer electrolyte membrane fuel cells (PEMFC), the amount of water in the cell affects the performances and degradation processes. Commonly, the main goal is try to reduce the humidification in order to simplifying the humidification system and enhancing the pe...

Water management represents one of the main challenges in the design and operation of PEMFCs. The influence of inlet gas humidification on cell performances is analyzed in general and especially the effect of low humidity conditions in both cathode and anode is studied. Hereby in situ diagnostic tools like EIS and current density measurements are u...

A 1D+1D model for Direct Ethanol Fuel Cells (DEFCs) is presented. The complex kinetics of the multi-step Ethanol Oxidation Reaction (EOR) is described using as starting point the kinetic model by Meyer et al. [1], which considers free and adsorbed intermediate species on a binary catalytic layer based on Pt. The effect of the adsorbed species is mo...